After Appendicitis Surgery

I had my appendix removed on tuesday night and was sent home wednesday afternoon. What I want is about how long will it take before I can go back to work and if I need to be on any special diet? Also I still have a lot of pain I try to walk around a little and sit down but I feel like I am streching my skin when I stand up. Is that normal?
I allready took off the patch they put on like they indicated and don't wet it but it looks nasty. Up to know I don't see any puss but it looks like I have skin sticking out is that normal too. Last question is it ok that I cover it up with gauze so it doesn't get infected? Thank you all who respond with answers I really appreciate it. :?